mirror of
https://github.com/servo/servo.git
synced 2025-10-03 18:19:14 +01:00
306 lines
12 KiB
HTML
306 lines
12 KiB
HTML
<!DOCTYPE html>
|
|
<meta charset="utf-8">
|
|
<title>ScrollTimeline current time algorithm</title>
|
|
<link rel="help" href="https://wicg.github.io/scroll-animations/#current-time-algorithm">
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
|
|
<script src="./resources/scrolltimeline-utils.js"></script>
|
|
|
|
<body></body>
|
|
|
|
<script>
|
|
test(function() {
|
|
const scroller = setupScrollTimelineTest();
|
|
// Set the timeRange such that currentTime maps directly to the value
|
|
// scrolled. The contents and scroller are square, so it suffices to compute
|
|
// one edge and use it for all the timelines.
|
|
const scrollerSize = scroller.scrollHeight - scroller.clientHeight;
|
|
|
|
const blockScrollTimeline = new ScrollTimeline(
|
|
{scrollSource: scroller, timeRange: scrollerSize, orientation: 'block'});
|
|
const inlineScrollTimeline = new ScrollTimeline(
|
|
{scrollSource: scroller, timeRange: scrollerSize, orientation: 'inline'});
|
|
const horizontalScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'horizontal'
|
|
});
|
|
const verticalScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'vertical'
|
|
});
|
|
|
|
// Unscrolled, all timelines should read a currentTime of 0.
|
|
assert_equals(
|
|
blockScrollTimeline.currentTime, 0, 'Unscrolled block timeline');
|
|
assert_equals(
|
|
inlineScrollTimeline.currentTime, 0, 'Unscrolled inline timeline');
|
|
assert_equals(
|
|
horizontalScrollTimeline.currentTime, 0,
|
|
'Unscrolled horizontal timeline');
|
|
assert_equals(
|
|
verticalScrollTimeline.currentTime, 0, 'Unscrolled vertical timeline');
|
|
|
|
// Do some scrolling and make sure that the ScrollTimelines update.
|
|
scroller.scrollTop = 50;
|
|
scroller.scrollLeft = 75;
|
|
|
|
// As noted above timeRange is mapped such that currentTime should be the
|
|
// scroll offset.
|
|
assert_equals(blockScrollTimeline.currentTime, 50, 'Scrolled block timeline');
|
|
assert_equals(
|
|
inlineScrollTimeline.currentTime, 75, 'Scrolled inline timeline');
|
|
assert_equals(
|
|
horizontalScrollTimeline.currentTime, 75, 'Scrolled horizontal timeline');
|
|
assert_equals(
|
|
verticalScrollTimeline.currentTime, 50, 'Scrolled vertical timeline');
|
|
}, 'currentTime calculates the correct time based on scrolled amount');
|
|
|
|
test(function() {
|
|
// It is difficult to calculate the scroll offset which results in an exact
|
|
// currentTime. Scrolling is calculated in integers which allows for the
|
|
// possibility of rounding, and scrollbar widths differ between platforms
|
|
// which means it is not possible to ensure a divisible scroller size. Instead
|
|
// the scroller content is made large enough that rounding differences result
|
|
// in negligible deltas in the output value.
|
|
const contentOverrides = new Map([['width', '1000px'], ['height', '1000px']]);
|
|
const scroller = setupScrollTimelineTest(new Map(), contentOverrides);
|
|
const scrollTimeline = new ScrollTimeline(
|
|
{scrollSource: scroller, timeRange: 100, orientation: 'block'});
|
|
|
|
// Mapping timeRange to 100 means the output is 'percentage scrolled', so
|
|
// calculate where the 50% scroll mark would be.
|
|
const halfwayY = (scroller.scrollHeight - scroller.clientHeight) / 2;
|
|
scroller.scrollTop = halfwayY;
|
|
|
|
assert_approx_equals(scrollTimeline.currentTime, 50, 0.5);
|
|
}, 'currentTime adjusts correctly for the timeRange');
|
|
|
|
test(function() {
|
|
const scroller = setupScrollTimelineTest();
|
|
// Set the timeRange such that currentTime maps directly to the value
|
|
// scrolled. The contents and scroller are square, so it suffices to compute
|
|
// one edge and use it for all the timelines.
|
|
const scrollerSize = scroller.scrollHeight - scroller.clientHeight;
|
|
|
|
const lengthScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
startScrollOffset: '20px'
|
|
});
|
|
const percentageScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
startScrollOffset: '20%'
|
|
});
|
|
const calcScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
startScrollOffset: 'calc(20% - 5px)'
|
|
});
|
|
|
|
// Unscrolled all timelines should read a current time of unresolved, as the
|
|
// current offset (0) will be less than the startScrollOffset.
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime, null,
|
|
'Unscrolled length-based timeline');
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime, null,
|
|
'Unscrolled percentage-based timeline');
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime, null, 'Unscrolled calc-based timeline');
|
|
|
|
// Check the length-based ScrollTimeline.
|
|
scroller.scrollTop = 19;
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime, null,
|
|
'Length-based timeline before the startScrollOffset point');
|
|
scroller.scrollTop = 20;
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime, 0,
|
|
'Length-based timeline at the startScrollOffset point');
|
|
scroller.scrollTop = 50;
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime,
|
|
calculateCurrentTime(50, 20, scrollerSize, scrollerSize),
|
|
'Length-based timeline after the startScrollOffsetPoint');
|
|
|
|
// Check the percentage-based ScrollTimeline.
|
|
scroller.scrollTop = 0.19 * scrollerSize;
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime, null,
|
|
'Percentage-based scroller before the startScrollOffset point');
|
|
scroller.scrollTop = 0.20 * scrollerSize;
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime, 0,
|
|
'Percentage-based scroller at the startScrollOffset point');
|
|
scroller.scrollTop = 0.50 * scrollerSize;
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scroller.scrollTop, 0.2 * scrollerSize, scrollerSize, scrollerSize),
|
|
'Percentage-based scroller after the startScrollOffset point');
|
|
|
|
// Check the calc-based ScrollTimeline.
|
|
scroller.scrollTop = 0.2 * scrollerSize - 10;
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime, null,
|
|
'Calc-based scroller before the startScrollOffset point');
|
|
scroller.scrollTop = 0.2 * scrollerSize - 5;
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime, 0,
|
|
'Calc-based scroller at the startScrollOffset point');
|
|
scroller.scrollTop = 0.2 * scrollerSize;
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scroller.scrollTop, 0.2 * scrollerSize - 5, scrollerSize,
|
|
scrollerSize),
|
|
'Calc-based scroller after the startScrollOffset point');
|
|
}, 'currentTime handles startScrollOffset correctly');
|
|
|
|
test(function() {
|
|
const scroller = setupScrollTimelineTest();
|
|
// Set the timeRange such that currentTime maps directly to the value
|
|
// scrolled. The contents and scroller are square, so it suffices to compute
|
|
// one edge and use it for all the timelines.
|
|
const scrollerSize = scroller.scrollHeight - scroller.clientHeight;
|
|
|
|
const lengthScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
endScrollOffset: (scrollerSize - 20) + 'px'
|
|
});
|
|
const percentageScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
endScrollOffset: '80%'
|
|
});
|
|
const calcScrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
endScrollOffset: 'calc(80% + 5px)'
|
|
});
|
|
|
|
// Check the length-based ScrollTimeline.
|
|
scroller.scrollTop = scrollerSize;
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime, null,
|
|
'Length-based timeline after the endScrollOffset point');
|
|
scroller.scrollTop = scrollerSize - 20;
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scrollerSize - 20, 0, scrollerSize - 20, scrollerSize),
|
|
'Length-based timeline at the endScrollOffset point');
|
|
scroller.scrollTop = scrollerSize - 50;
|
|
assert_equals(
|
|
lengthScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scrollerSize - 50, 0, scrollerSize - 20, scrollerSize),
|
|
'Length-based timeline before the endScrollOffset point');
|
|
|
|
// Check the percentage-based ScrollTimeline.
|
|
scroller.scrollTop = 0.81 * scrollerSize;
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime, null,
|
|
'Percentage-based timeline after the endScrollOffset point');
|
|
scroller.scrollTop = 0.80 * scrollerSize;
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scroller.scrollTop, 0, 0.8 * scrollerSize, scrollerSize),
|
|
'Percentage-based timeline at the endScrollOffset point');
|
|
scroller.scrollTop = 0.50 * scrollerSize;
|
|
assert_equals(
|
|
percentageScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scroller.scrollTop, 0, 0.8 * scrollerSize, scrollerSize),
|
|
'Percentage-based timeline before the endScrollOffset point');
|
|
|
|
// Check the calc-based ScrollTimeline.
|
|
scroller.scrollTop = 0.8 * scrollerSize + 6;
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime, null,
|
|
'Calc-based timeline after the endScrollOffset point');
|
|
scroller.scrollTop = 0.8 * scrollerSize + 5;
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scroller.scrollTop, 0, 0.8 * scrollerSize + 5, scrollerSize),
|
|
'Calc-based timeline at the endScrollOffset point');
|
|
scroller.scrollTop = 0.5 * scrollerSize;
|
|
assert_equals(
|
|
calcScrollTimeline.currentTime,
|
|
calculateCurrentTime(
|
|
scroller.scrollTop, 0, 0.8 * scrollerSize + 5, scrollerSize),
|
|
'Calc-based timeline before the endScrollOffset point');
|
|
}, 'currentTime handles endScrollOffset correctly');
|
|
|
|
test(function() {
|
|
const scroller = setupScrollTimelineTest();
|
|
// Set the timeRange such that currentTime maps directly to the value
|
|
// scrolled. The contents and scroller are square, so it suffices to compute
|
|
// one edge and use it for all the timelines.
|
|
const scrollerSize = scroller.scrollHeight - scroller.clientHeight;
|
|
|
|
const scrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
startScrollOffset: '20px',
|
|
endScrollOffset: (scrollerSize - 50) + 'px'
|
|
});
|
|
|
|
scroller.scrollTop = 150;
|
|
assert_equals(
|
|
scrollTimeline.currentTime,
|
|
calculateCurrentTime(150, 20, scrollerSize - 50, scrollerSize));
|
|
}, 'currentTime handles startScrollOffset and endScrollOffset together correctly');
|
|
|
|
test(function() {
|
|
const scroller = setupScrollTimelineTest();
|
|
// Set the timeRange such that currentTime maps directly to the value
|
|
// scrolled. The contents and scroller are square, so it suffices to compute
|
|
// one edge and use it for all the timelines.
|
|
const scrollerSize = scroller.scrollHeight - scroller.clientHeight;
|
|
|
|
const scrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
startScrollOffset: '20px',
|
|
endScrollOffset: '20px',
|
|
});
|
|
|
|
scroller.scrollTop = 150;
|
|
assert_equals(scrollTimeline.currentTime, null);
|
|
}, 'currentTime handles startScrollOffset == endScrollOffset correctly');
|
|
|
|
test(function() {
|
|
const scroller = setupScrollTimelineTest();
|
|
// Set the timeRange such that currentTime maps directly to the value
|
|
// scrolled. The contents and scroller are square, so it suffices to compute
|
|
// one edge and use it for all the timelines.
|
|
const scrollerSize = scroller.scrollHeight - scroller.clientHeight;
|
|
|
|
const scrollTimeline = new ScrollTimeline({
|
|
scrollSource: scroller,
|
|
timeRange: scrollerSize,
|
|
orientation: 'block',
|
|
startScrollOffset: '50px',
|
|
endScrollOffset: '10px',
|
|
});
|
|
|
|
scroller.scrollTop = 150;
|
|
assert_equals(scrollTimeline.currentTime, null);
|
|
}, 'currentTime handles startScrollOffset > endScrollOffset correctly');
|
|
</script>
|